<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="test"></div>
    <script type="text/javascript" src="../js/react.development.js"></script>
    <script type="text/javascript" src="../js/react-dom.development.js"></script>
    <script type="text/javascript" src="../js/babel.min.js"></script>
    <script type="text/javascript" src="../js/prop-types.js"></script>
    <script type="text/babel">
        class Life extends React.Component{
            state={
                opacity:.5
            }
            // 卸载组件
            death=()=>{
                    ReactDOM.unmountComponentAtNode(document.getElementById('test'))
            }
            //挂载组件
            componentDidMount(){
                let {opacity} = this.state
                this.timer= setInterval(()=>{
                    opacity -= 0.1
                    if(opacity<=0){
                        opacity=1
                    }
                    this.setState({opacity})
                },200)
            }
            //卸载组件前
            componentWillUnmount(){
                clearInterval(this.timer)
            }
            render(){
                
                const {opacity}  = this.state
                return (
                    <div>
                        <h1 style={{opacity}}>生命周期</h1>
                        <button onClick={this.death}>卸载组件</button>
                    </div>
                )
            }
        }

        ReactDOM.render(<Life/>,document.getElementById('test'))
    </script>
</body>

</html>